linux-kernel - Re: [PATCH v7 3/3] arm64: implement KPROBES_ON

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Message-Id: <20200725015445.d789abc36fcef2d7bd3436dd@kernel.org>
Date:   Sat, 25 Jul 2020 01:54:45 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Will Deacon <will@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v7 3/3] arm64: implement KPROBES_ON_FTRACE

On Fri, 24 Jul 2020 15:06:11 +0800
Jisheng Zhang <Jisheng.Zhang@...aptics.com> wrote:

> 
> On Tue, 21 Jul 2020 22:24:55 +0900 Masami Hiramatsu wrote:
> 
> > 
> > 
> > Hi Jisheng,
> 
> Hi,
> 
> > 
> > Would you be still working on this series?
> 
> I will rebase the implementation on the latest code, then try to address
> your comments and Mark's comments. I will send out patches in this weekend.
> 
> > 
> > If you are still want to put a probe on func+4, it is OK if you can
> > completely emulate the 1st instruction. (lr save on the stack and
> > change the regs->sp)
> 
> Will check which is the better solution.

Thanks Jisheng!

What I'm considering is the consistency of pre_handler()@addr and 
post_handler()@addr+4. Also, whether the value of regs (and stacks) is
same as the user expected.

Thank you,

-- 
Masami Hiramatsu <mhiramat@...nel.org>